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plug and feathers

noun
  1. an apparatus for splitting stone, consisting of two tapered bars (feathers), inserted into a hole drilled into the stone, between which a narrow wedge (plug) is hammered to spread them.
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Origin of plug and feathers

First recorded in 1835–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018